Post on 24-Jun-2015
description
transcript
Tripoli University
Faculty of Engineering
Chemical Engineering department
Subject
Gas Processors
hassanbnjm074@gmail.com
hassansalem70@yahoo.com
B. SC:
Hassan Salem Bin-Najma
Q1 - Calculate the temperature for hydrate formation at 1000 psia for a gas with the following composition
80% C1 , 10% C2 , 5% C3 , 5% N2. Use Katz and shortcut method ?
Solution
Katz method
shortcut method
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Q2 – what is the minimum temperature The will permit expansion of the will permit expansion of the above gas
to 400 psia ?
Solution
From Fig 20-14 (sp.gr 1= 0.6) at ( P1=1000 psia and P2=400 psia ) = T1 = 77 °F
From Q1 sp.gr = 0.6714 T = ? °F
From Fig 20-15 (sp.gr 2 = 0.7) at ( P1=1000 psia and P2=400 psia ) = T2 = 102 °F
Interpolating at T1 and T2
Q3 – what is the minimum expansion pressure of the above gas that can be used without hydrate formation ?
Solution
From Fig 20-14 (sp.gr 1= 0.6) at ( P1=1000 psia and T1 = 80 °F ) = P1 = 340 psia
From Q1 sp.gr = 0.6714 P2 = ? psia
From Fig 20-15 (sp.gr 2 = 0.7) at ( P1=1000 psia and T1 = 80 °F ) = P2 = 800 psia
Interpolating at P1 and P2
2
102 - 77 =
T - 77
T = 94.85 °F
0.7 - 0.6 0.6714 - 0.6
800 - 340 =
P - 340
P = 688.44 psia
0.7 - 0.6 0.6714 - 0.6
Q 4 – estimate the inhibitor injection volume rate required to prevent hydrate formation for 80% C1 ,
15% C2 , 5% N2 the Pipe Line on the surface of the earth ?
Solution
32 °F ˃ 14 °F for DEG
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compnent yi MWi yi * MWi
C1 0.8 16.04276 12.83421
C2 0.15 30.06964 4.510446
N2 0.05 28.01348 1.400674
Totals 1
avg MWi 18.74533
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Q 5 – estimate the inhibitor injection volume rate required to prevent hydrate formation ?
Solution
20 °F ˃ 14 °F for DEG
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Q 6 – estimate the inhibitor injection volume rate required to prevent hydrate formation ?
Solution
-8 °F ˂ 14 °F for MeoH
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Reference
1- Gas-Conditioning-Processing-Vol-1-campbell
2- GPSA - Gas Processors Suppliers Association, Engineering Data Book (12th Ed)
Excel Solution And Aspen Plus Or Hysys : Gas Processors Q1 , Q2 , Q3 for
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Excel Solution And Aspen Plus Or Hysys : Gas Processors Q4 , Q5 , Q6 for
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